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template toLocation*(result: var string, file: string | cstring, line: int, col: int) =
## avoids spurious allocations
# Hopefully this can be re-used everywhere so that if a user needs to customize,
# it can be done in a single place.
result.add file
if line > 0:
result.add "("
# simplify this after moving moving `include strmantle` above import assertions`
when declared(addInt): result.addInt line
else: result.add $line
if col > 0:
result.add ", "
when declared(addInt): result.addInt col
else: result.add $col
result.add ")"
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